The possibilities of the analysis of cerebrospinal fluid (CSF) are explained from the aspect of a clearly arranged representation, partly in tabular form, concerning the following details: --the relation of the findings of CSF, in particular the cytological results, to the course of disease, --the special cytological methods for determination of cells in CSF, --cytomorphological characteristics of malignancy in regard of activated cells inflammatory reactions, --the assessment of the results of qualitative analyses of proteins and the differentiation of an intrathecal production of immunoglobulins opposite to the impairment of the barriers, --the damage of parameters of CSF by artificial factors. In case of the determination of distinct CSF syndromes results a special diagnostical consequence before all for exsudative, immunoreactive and inflammatory disorders, vascular disease and tumors of the nervous system.